Effective Java学习记录

ACder_chen

于 2017-11-06 11:12:24 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/qqchenjunwei/article/details/78455732

本文详细介绍Java中Builder模式的应用，通过具体实例展示如何使用该模式来构造复杂对象，特别是在Student类的实现中，使得对象创建过程更为灵活且易于理解。

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详细学习笔记链接：

http://www.cnblogs.com/yulinfeng/archive/2017/08/03/7282649.html

1 Builder模式

package com.qunar.bean;

/**
 * Created by chenjunwei on 2017/11/6.
 */
public class Student {

    private String name;
    private int age;
    private String sex;
    private String grade;

    public static class Builder {

        private String name;
        private int age;
        private String sex = "";
        protected String grade = "";

        public Builder(String name, int age) {
            this.name = name;
            this.age = age;
        }

        public Builder sex(String sex) {
            this.sex = sex;
            return this;
        }

        public Builder grade(String grade) {
            this.grade = grade;
            return this;
        }

        public Student build() {
            return new Student(this);
        }
    }

    private Student(Builder builder) {
        this.name = builder.name;
        this.age = builder.age;
        this.sex = builder.sex;
        this.grade = builder.grade;
    }
}